reduce entropy use in integration tests

test/integration/helpers.py

@@ -66,26 +66,30 @@
 BUCKET_NAME_LENGTH = BUCKET_NAME_LENGTH_RANGE[1]
 BUCKET_CREATED_AT_MILLIS = 'created_at_millis'
 
+RNG = secrets.SystemRandom()
+RNG_SEED = str(RNG.random())
+RNG_COUNTER = 0
+
+if sys.version_info < (3, 9):
+    RNG.randbytes = lambda n: RNG.getrandbits(n * 8).to_bytes(n, 'little')
+
 SSE_NONE = EncryptionSetting(mode=EncryptionMode.NONE,)
 SSE_B2_AES = EncryptionSetting(
     mode=EncryptionMode.SSE_B2,
     algorithm=EncryptionAlgorithm.AES256,
 )
+_SSE_KEY = RNG.randbytes(32)
 SSE_C_AES = EncryptionSetting(
     mode=EncryptionMode.SSE_C,
     algorithm=EncryptionAlgorithm.AES256,
-    key=EncryptionKey(secret=os.urandom(32), key_id='user-generated-key-id')
+    key=EncryptionKey(secret=_SSE_KEY, key_id='user-generated-key-id')
 )
 SSE_C_AES_2 = EncryptionSetting(
     mode=EncryptionMode.SSE_C,
     algorithm=EncryptionAlgorithm.AES256,
-    key=EncryptionKey(secret=os.urandom(32), key_id='another-user-generated-key-id')
+    key=EncryptionKey(secret=_SSE_KEY, key_id='another-user-generated-key-id')
 )
 
-RNG = secrets.SystemRandom()
-RNG_SEED = str(RNG.random())
-RNG_COUNTER = 0
-
 
 def bucket_name_part(length: int) -> str:
     assert length >= 1